Device for feeding high pressure boilers



Jan. 19, 1937. HAHNLE 2,068,409

DEVICE FOR FEEDING HIGH PRESSURE BOILERS Filed Feb. 27, 1934 Patented Jan. 19, 1937 UNITED STATES PATENT OFFICE DEVICE FOR FEEDING HIGH PRESSURE BOILERS Hermann Halmle, Giengen-on-the-Brenz, Germany 1 Claim.

This invention relates to a device for feeding high pressure boilers of the type described in my Patent #1,933,853 of November 7th, 1933. In this patent a device is described wherein the pump working against the pressure of the boiler "for the preliminary heating of the feeding water which is situated in hermetically closed heat exchangers. The water situated in these heat exchanging containers is kept under high pressure so that it can be heated to a high temperature, even close to the temperature of the boiler, without being transformed into steam.

As stated in the above mentioned patent the pressure of the exhaust steam of the feeding devices can be lowered before the steam is introduced into a heat exchanger, the pressure being preferably diminished in a power engine. The subject matter of the present invention is the further development of this feature and the application thereof to steam boilers connected with steam conduits supplying steam under different pressures. For example, the subject matter of the present invention can be applied to a system of conduits having steam of a comparatively low pressure which is supplied with steam from a machine which operates on the steam of a high pressure boiler or from boilers containing steam of a correspondingly low pressure.

It is known in prior art to introduce into a low pressure system the exhaust steam of other steam consuming units, said exhaust steam having substantially the same pressure as that of said system. However, devices of this type operate under entirely different circumstances. In my above mentioned patent containers for steam are described which operate intermittently and which contain steam having a very high original pressure. These containers cannot be employed as a source of steam. which must be supplied continuously under a low pressure and cannot be easily combined with such devices.

An object of the present invention is the provision of a device by means of which steam situated in the containers described in my above mentioned patent can be continuously supplied to a conduit system containing steam under a comparatively low pressure.

The above and other objects of this invention may be realized through the provision of a device comprising a high pressure boiler which is combined with a consuming unit for the steam having a corresponding original pressure. The device is further provided with a system of conduits containing steam of a low pressure, a feeding pump and at least two feeding devices which are connected in series with a hermetically closed heat exchanger; conduits connect the steam chamber of the boiler with the upper portion of the feeding devices. Conduits are also provided between the lower portion of the feeding device and the heat exchanger. The boiler is connected in series with the heat exchanger and the water chamber of the boiler is connected with said lower portion of the feeding devices. The conduits for the steam and water are provided with valves which intermittently switch the feeding devices on and off and connect them either with the steam chamber or with the water chamber of the boiler. When the feeding devices are empty this upper portion is connected with the heat exchanger or with the low pressure conduit system. As soon as the pressure of the exhausted steam drops to that of the pump the lower portion of the feeding device is connected with the pump so that the former is supplied with water.

The invention will appear more clearly from the following detailed description when taken in connection with the accompanying drawing showing a feeding device constructed in accordance with the principles of the present invention.

The diagram illustrates a high pressure boiler I and a steam engine or machine 2. A low pressure conduit system 3 is connected with the machine 2 by a system of pipes 4 provided with a valve 5 and is supplied with steam from the machine 2. The conduit system 3 which is adapted to contain steam under low pressure may also be supplied with said steam from boilers not shown in the drawing which are adapted totransmit steam of this low pressure to the conduit system 3. The boiler I is supplied with water in the same manner as that described in my above mentioned patent, namely, through two feeding devices 6 and 6. The way in which the two feeding devices 6 intermittently supply water to the boiler l is fully described in my above mentioned patent. The'feeding device 6 is connected by a pipe 8 provided with a valve 9 with the steam conduit 1 of the boiler while the feeding device 6' is connected with a conduit 1 by a pipe 8 having a valve 9. The upper portion of the container 6 is connected with a pipe H which is provided with valves I0 and ID. The pipe ll leads to a heating coil l2 which is situated Within a heat exchanging container I2. The container 6' is connected with -a pipe I I by a pipe II having valves I0" and lil'. Another pipe I4 forms a continuation of the pipe II and is provided with a valve I3. The pipe II leads to the low pressure conduit system 3. Similarly, the pipe I4 leading to the system 3 forms a continuation of the pipe II' and has a valve I3. The bottom of the container 6 is connected by a pipe I6 which is provided with a valve IS with the bottom of the heat exchanger I2, while the top of the heat exchanger I2 is connected by a pipe I? with the boiler I. Apipe I6 having a valve I5 connects the container 6 With the pipe I6. A feeding pump is provided with a pipe IB which carries a non-return valve I9 and which leads to the lower portion of the container 6. A pipe I8 having a non-return valve I9 connects the pipe It with the container 6. The device operates as follows: After the feeding device 6 has completed its operation, the valves 9 and I5 are closed and the valves I0 and I0 opened. The exhaust steam of the container 6 flows through the heating coil I2 and the steam in the container 6 drops substantially to the pressure of the conduit system 3. Then the valve I0 is closed and the valve I3 is opened. At the same time the valve I9 is operated as described and illustrated in my above mentioned patent so that the container 9 is again filled with water which forces the steam remaining in the container 6 into the system 3. Then the valves I9, I3 and I9 are closed and the valves 9 and I5 are opened again, so that the water contained in the container 6 flows to the boiler or the heat exchanger I2.

The same process is carried out with respect to the feeding device or container 6. However, the container 6' transmits its water to the boiler and the first portion of its steam to the heating coil I2 of the heat exchanger I2 while the container 6 is being filled with water; the container 6' gives up the last part of its steam to the lower pressure system 3 and is filled with water while the container 6 transmits its steam to the heating coil I 2.

The valves are operated in the manner described in my above-mentioned patent.

I claim:

A device for feeding high-pressure boilers, comprising in combination with a high-pressure boiler, a feed pump and a low-pressure system; at least two feeding devices adapted to contain water and steam, a heat exchanger having a heating coil and connected at one of its ends with the bottom of said boiler, conduits for steam having valves and connecting the steam chamber of the boiler with the upper portions of said feeding devices, conduits for water having valves and connecting the lower portions of said feeding devices with the other end of said heat exconnecting said feed pump with the lower portions of said feeding devices, whereby the feeding devices may be connected intermittently and one after the other with the boiler, that feeding device which is filled with steam being first connected with said heating coil to reduce its steam pressure to that of the low-pressure system. and then connected with said low-pressure system and said feed pump, whereupon this cycle of operation may be repeated.

I-IERMANN HAHNLE. 

